Optician&#39;s rule.



No. 794.068. PATENTE!) JULY 4, 1965. W. GL ALLARDT. UPTIC'INS RULE.

APPLIUATION FILED IV'V.16,1904.

2 BHEET--EHEET .'L`

ulllml ATTORNEY.

PATENTED JULY el., 1905.

No. '7g4-.068.

W. G. LLRDT. UPTIGIANS RULE.

APPLICATION FILED Nov. 16,1904.

2 SHEETS-HEET 2.

JVVEIVTOR.

haar

laseren ll'lrafriis Patented July d, Mimi.

Ul? Ul'illillliillil Nil, tllllO.

SJEJECI'JEit'lZJlL'lN forming part of Letters llPatent No. '794,0Gil, dated .Tnly 4, lltllfl Applieatiun liiefi November 16, 1904. Serial No. 232,046.

To /tf/ whom, fil' mfr/yantec/'10:

lie/it lnown that Ll'VILLi/m ti. Ahmmrr, a citizenol' the United States, residing attllcveland, in the county ol Cuyahoga and State ol l(Ylhio, have ii'ivented certain new and usel'ul lmln'm'ements in Opticians bailes; and Yl do declare that the tollonf'ing isa l'ull, clear, and exactdescription ol the invention, which will enable others skilled in the art to which it appertains to make and use the same.

llily izwentiol'i relates to opticians rules; and the invention consists in a rule constrnctml and adapted to operate substalitially as shown and described, and particularly pointed out in the claims.

ln the acconmanying drawings, Figures l, 2 Lll., and l5, respirictively, are lront Full-tace views ot' the rule with the movable parts thereon in lillerent positioils, according to the measurmnents to be made and all as hereina'l'ter l'ully described. Fig. 3 is a cross-section on line 3 3, Fig. 1; and liig. 5 is a cross-sec tion on line 5 5, Fig. (i.

A represents the rule itself or the piece ol sheet metal which constitutes the rnlef socalled, and without the attached or movable portions or parts thereon. Ubviously in a true sense these parts are necessary to complete the article and make an operative device as to all or nearly all the usesotl the rule; but 'lior the purpose ol this description the part A is considered the rule, and (l and l) are separate parts or members thereon having separate functions and uses, as will presently aliniiear.

Upon the lace ot the rule proper are variously-disposcd scales or dials for taking dillierent measurements in conjunction with index-linger U or slide l l, as well as lor certain other purposes independent oli these movable members. '.lhus there is shown a segmental dial 2 in conjunction with the point or pointer of index-linger t), and a straight scale 3 in conjunction with the pointol: slide l), as well asa fractional scale 5 at the edge ol the rule below the slot (t, in which the slide ll is movably conlined, and there is also a segmental or semicircnlar dial 4; near the right end ol the rule and scales li and i at or across the ends ol' the rule. All these scales and dials may be written wholly in inches and fractions thereol or wholly in millimeters or partly in both, as iu this instance, and the idea ol'l the rnle is to adapt it more especially For use in measurements in or with what are known as "spectacles rather than with nose-glasses, as such; but obviously any practical use may may be made of the rule and be within the invention.

'libe dial-linger or hand C is jiiivoted centrally near the upper edge olI the rnle com- ]:iaratively near its own midi'lle and has a pointer extremity below its pivot and has a scale along its upper end, whilea spring e is laid upon its right-angled edge c and provided with a bend c n'iidway its length adapted to engage the bow B oi' the glasses or spectacles, as seen in Fig. l, and hold the saine jirmly against the llanged edge ol the said linger'.

New assuming, lor example, that an optician has a prescription for glasses belere him to be filled and a certain angle of bridge or nose piece in respect to the plane ol the lens be prescribed. ln such case to obtain the desired angle the bridge is engaged on the linger C beneath spring c under bend ewhcre it is lirmly held by the spring,whilc the pointer c" olI the linger on the scale Q tells exactly what its angle is, the lens in the ineaiiwhile being` shown to be in right relatioii to the rule by comparison with the plain relatively close parallel cross-lines El midway the length ol the rnle and near the pivot-point olt linger' t). l'l'aving lionnd the angle ole the bridge as it may be origii'n'tlly and seeing what the prescription calls lor, the bridges can be easily bent to such d sircd angle in the usual way, and having been ascertained to be right the l'irst rerpiirement ol the iirescription is lilled. 'Vlhe next measurement may be assnn'ied to be the width ot the bridge at its base to adapt it to the nose olE the wearer, and there is much variance as to this single requirement because ol thedili'erenccs in the width ol noses at this ioint. Tlf h is is aseertitined bv means olE slide l straight measuring edge of slide D, as seen at the lett in l. yEhe point ol the slide l) will tell when the right width is reached.

A third test or measurement may be the exact from the graduated scale 6 at the end ot' the v rule. Either` end ot' the rule can be used tor this purpose. As shown, the bridge is back from or retired from the plane ot' the lens relatively as shown and presumably as prescribed. Another measurement and test is shown at the right in Fig. l, by which thc angle et' the temple or ear wire T is adapted to be worked out, according to the width oi the face to which it is to be applied. Here also there is much variance. rlhis is done when widening is needed by liling down the temple or wire butt to suit the demand, and the exact angle desired is determined by placing the rim Lllat against the back ot' the rule centrally behind scale sl. and sweeping the temple T over the said scale till the right angle reached.

in Fig. 2 two distinct n'ieasurements are shown, including the height ol the bridge on linger (j and the width ot a lens, by placing the saine between slide D and the iiXed stop i and getting the right size on scale B. In the ease of the height ot' bridge the lens-rims are laid against the rule and brought in line with the top edge directly at their middle or center, and the bridge is laid against the linger C when in a right-angled position, as

This gives the relatufe height as reshown. spects the lens, but dil'lers from what linown as the cdepth ot' the bridge, disclosed in lFig. Yin this latter measurement the bridge is set with its base-points directly upon the edge oi'l the rule, and the elevation or depth is ascertained by the scale on linger U and only as between its own base and its crown or top. lhen there is still another measurement shown in Fig. (S, by which the caitward or ont position ot' the crown ot the bridge to or from the plane olE the lens determined and which is the reverse olE what is seen aY the top and lelt in Fig. l, th linger (l being used lior this pury pose also, while the lens-rims are laid llat upon the edge oiLl the rule, as shown.

The entire rule, as thus shown and used, does not usually exceed seven inches in length by about one inch in width and is preferably, though not necessarily, fashioned outof some suitable sheet metal, such as alu mininm, brass, or steel.

l. As a new articlcolI manufacture, an optical rule having an index-linger piroted thereon between its ends and at one edge there-ol, and a slide at one end ot said rule adjustably engaged ina slottherein, and measu ring-scales on the tace ot' the rule associated with said linger and slide, substantially as described.

2. An optical rule and an index-linger pivoted between its ends at one edge thereoi2 and provided with a pointer below its pivot overlying the tace et' the rule, and a dial on the rule over which said pointer is adapted to sweep, said linger provided with a measuringscale on its upper portion and means to support eyeglasses across its edge, substai'itially as described.

3. In optical rules, a rule and a linger pivoted between its ends on the edge oli the rule and provided with a measuring-scale running lengthwise on its upper portion and a spring on its edge to hold eyeglasses thertmn, andan arc-shaped dial across the face of the rule overlapped by one end of the said linger, substantially as describeiil.

e. .ln optical rules, a rule and a linger pirotcd thereon having a pointer overla pping the side ol the rule, means on the linger to remorably secure a spectacle-irame and an index on the rule opposite said pointer and parallel cross-lines next to 'said index on the (umoste side ol the iinger-pivot, substantially as described.

ln testimony whereof `l sign this specilication, in the presence of two witnosses.v October 19, 190i.

VVr'itnesses:

li. ',l. Fisuinz, l. l. Mosul. 

